Apex Interview questions with answers

Ques : Which SOQL statement can be used to fetch all records even from recycle bin ?

Answer: “ALL Rows”  clause of SOQL can retrieve all records, including the records from recycle bin.

SELECT COUNT() FROM Contact WHERE AccountId = a.Id ALL ROWS

Question: How can you lock a record using SOQL to prevent it from being modified by another user?

Answer: We will need “FOR UPDATE” clause of SOQL.

Account [] accts = [SELECT Id FROM Account LIMIT 2 FOR UPDATE]; 

Question: If you have set up more than one savepoint, and then you roll back to a savepoint which is not the last savepoint, what will happen to the later savepoint variables?

Answer: If you generated savepoint SP1 first and generated SP2 savepoint after that, and if you rolled back to SP1, the variable SP2 will no longer be valid. You will receive a runtime error if you try to use it.

 

Question: What are few limitations of Savepoint or Transaction control in Apex?

Answer: Below are some points to remember:

  • Each savepoint you set counts against the Governor limit for DML statements.
  • If you insert the ID on an SObject after setting the savepoint, the ID will not be cleared after a rollback.
  • Static variables are not reverted during a rollback. If you run the trigger again, the static variables will retain the values from the previous run.

 

Question: What is the difference between public and Global class in Apex?

Public access modifier in Salesforce is different than the public modifier in Java. A public class can be accessed within an application or namespace. Whereas Global class is visible everywhere : in any application or namespace. Webservice must be declared as Global so that it can be accessed outside of the application. Global variable is similar to public modifier in Java.

 

Question: What are some points to remember regarding Static Keyword in apex.

  • Apex classes cannot be static.
  • Static variables are static only in scope of request.
  • Static variables and static blocks runs in the same order as they are declared inside the class.
  • Static variables are not transferred as a part of view state.

This Post Has 4 Comments

  1. Owsme …your hard work is appreciated,

  2. Thank for sharing interview questions, can you share some more recent frequently ask questions in interview.

  3. thank you

  4. Thank you for Sharing great list of Salesforce interview questions. i am searching the Job in salesforce developer.

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